When most people think of gold, they think of Fort Knox, or a phat set of grillz. The exceptionally nerdy -- like some people at popsci.com -- automatically recall gold's atomic number of 79. But no one suspected gold's role as nature's nanotechnological answer for purifying air, except for a team of researchers from the Queensland University of Technology.

On Wednesday, the BBC reported that millions of dollars in gold at the central bank of Ethiopia has turned out to be fake: What were supposed to be bars of solid gold turned out to be nothing more than gold-plated steel. They tried to sell the stuff to South Africa and it was sent back when the South Africans noticed this little problem.

Dept.: Gray Matter
Element: Gold
Project: Gilding
Cost: $60
Time: One hour
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